[R] need means on all boxplots, but only half of them got that

[S Ellison]

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>boxplot( Daten$weight~interaction(Daten$Dosis,Daten$sex, drop=TRUE))
>means<-tapply( Daten$weight, Daten$Dosis, mean)
>points(means, pch=5, col="red", lwd=5)
>
> ...only the boxplots for male got that point on them, 
> its really weird because I don't think that I separated the sex in the codes above
Look again; the boxplot is clearly distinguished by sex.

Try 
means<-tapply( Daten$weight, interaction(Daten$Dosis,Daten$sex, drop=TRUE), mean)

S Ellison

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